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Re: Callback when movie is finished

This is a follow up to <http://lists.apple.com/archives/QuickTime-API/ 2005/Jan/msg00178.html> where the poster was trying to get notifications that a movie had stopped playing. The technique he was using involves registering a TimeBase callback and is described at <http://developer.apple.com/qa/qa2001/qa1282.html>. He was unable to get it to work (the callback was never called). He was using Cocoa.

I spent the better part of a day trying to use the same technique, also in Cocoa, to detect when a sound was done playing (i.e. no on screen presence required, ergo no NSMovieView; just an NSMovie). I also was not able to get it to work at first.

It turns out that TimeBase callbacks don't work (the callback is never called) unless there is a MovieController is attached to the movie (!). Putting an NSMovie in an NSMovieView attaches a MovieController, and voila! The callback now works.

Why this should be is a mystery. You'd think TimeBase functionality would be completely independent of MovieControllers (sigh) but there it is.

Is this a peculiarity of QuickTime in Cocoa, or does it happen in Carbon apps as well? Or perhaps I missed the documented dependence of TimeBase callbacks on having MovieControllers attached to Movies?

_murat



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